10 Jun UST 289 – Biological activity will slow or stop at or below
Question
Biological activity will slow or stop at or below the freezing point of 32 degrees F or 0 degrees C.
a.True
b.False
2. The active layer of permafrost terrains is due to seasonal thaws.
a) True
b) False
3. Earthworms rework the soil with their burrowing and as they ingest decaying matter carry it from the surface to the area below where they redeposit it in the form of waste.
a)True
b) False
4. Plant nutrients which are high in magnesium, calcium, potassium and sodium have a positive charge. This means they are repelled by colloids.
a)True
b)False
5. Glaciers move because:
a.ground water pushes it from below while the Coriolis effect acts to deflect the movement
b.the wind blows the snow
c.the cold ice is more dense and wind currents make it sink
d.gravity pulls them downward and the weight of the overlying snow pushes outwards
10 points
6. The three sizes of soil are sand, silt and;
a.Clay
b.Loam
c.Humus
d.None of the above
7.The importance of colloids is their ability to attract soil nutrients.
a. True
b.False
10 points
8. A ph value lower than 7 indicates alkaline soil.
a.True
b.False
10 points
9. Soil horizons develop by either removal or accumulation of ions, colloids and chemical compounds.
a. True
b. False
10 points
10. One of the common forms of parent material that over time becomes soil is called;
a. Monotlith
b. Regolith
c. Soilith
d. Humolith
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